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| 1 | Saline soil enzyme activities of four plant communities in Sangong River basin of Xinjiang,China显示文摘Soil enzyme activity plays an important role in the conversion of soil organic carbon into inorganic carbon,which is significant for the global carbon cycle.In this study,we investigated the soil enzyme activities of two ligninolytic enzymes(peroxidase and polyphenol oxidase)and five non-ligninolytic enzymes(α-1,4-glucosidase(AG);β-1,4-glucosidase(BG);N-acetyl-β-glucosaminidase(NAG);β-D-cellobiosidase(CBH);andβ-xylosidase(BXYL))in four plant communities of the Sangong River basin in Fukang,North Xinjiang,China.The four typical plant communities were dominated by Haloxylon ammodendron,Reaumuria soongonica,Salsola passerina,and Tamarix rarmosissima,respectively,with saline soils of varied alkalinity.The results showed that the soil peroxidase activity decreased seasonally.The activities of the five non-ligninolytic enzymes decreased with increasing soil depths,while those of the two ligninolytic enzymes did not show such a trend.In the four plant communities,BG had the highest activity among the five non-ligninolytic enzymes,and the activities of the two ligninolytic enzymes were higher than those of the four non-ligninolytic ones(AG,NAG,CBH,and BXYL).The community of H.ammodendron displayed the highest activity with respect to the two ligninolytic enzymes in most cases,but no significant differences were found among the four plant communities.The geometric mean of soil enzyme activities of the four plant communities was validated through an independently performed principal component analysis(PCA),which indicated that different plant communities had different soil enzyme activities.The correlation analysis showed that soil polyphenol oxidase activity was significantly positively correlated with the activities of the five non-ligninolytic enzymes.The soil pH value was positively correlated with the activities of all soil enzymes except peroxidase.Soil microbial carbon content also showed a significant positive correlation(P<0.01)with the activities of all soil enzymes except polyphenol oxidase.The results suggested that the H.ammodendron community has the highest ability to utilize soil organic carbon,and glucoside could be the most extensively utilized non-ligninolytic carbon source in the saline soil of arid areas in Xinjiang. | ZhengJun GUAN Qian LUO Xi CHEN XianWei FENG ZhiXi TANG Wei WEI YuanRun ZHENG | 2014 | Journal of Arid Land2014，6，2： | 11 |
| 2 | Microorganism population in two-phase anaerobic fermentation of separated liquid of dairy manure显示文摘In order to reduce incomplete fermentation caused by high substrate viscosity and low mass transfer efficiency during fermentation process,batch and two-phase anaerobic fermentation experiments were conducted in this study.Dairy manure was separated by using solid-liquid separator firstly.Separated liquid(SL)and diluted dairy manure(DDM)as raw materials were evaluated in terms of gas production performance for both batch and two-phase anaerobic fermentation.The microorganism population was characterized by scanning electron microscope(SEM)and Denaturing Gradient Gel Electrophoresis(DGGE).The results showed that Volatile Solid(VS)methane yield of SL was 124.51 L/kg VS,which was 2.09 times higher than that of DDM(59.50 L/kg VS)in batch anaerobic fermentation.The Bacteroides and Veillonella with higher activity were the majority microorganism population in acidogenic phase,whereas the Firmicutes and Corynebacterium with methanogenic properties became the predominant microorganism population in methanogenic phase.This study achieved the phase separation and improved the gas production performance. | Qiang Li Zhengjun Guan Guoxiang Zheng | 2018 | International Journal of Agricultural and Biological Engineering2018，11，1： | 3 |
| 3 | Two-phase anaerobic co-digestion of dairy manure with swine manure显示文摘In order to solve the problems associated with high fiber content,and the ensuing lower biogas volume yield in anaerobic digestion of dairy manure,a study of the co-digestion of separated liquids from dairy manure combined with swine manure using a two-phase anaerobic digestion process was conducted.The influence of level of total solids(TS)and hydraulic retention time(HRT)of the mixed liquor on the specific methane production were studied.Three TS levels 8%,10%and 12%were investigated.Analysis of the results show that a maximum specific methane yield of 132.99 L/kg volatile solids(VS),can be obtained with a TS of 9%,an inoculation rate of 30%,the duration of hydrolytic acidification phase of 5 d,and an HRT of the methanogenic phase of 10 d.These findings could provide directions for improving the biogas production by performing the co-digestion of dairy manure with swine manure. | Guan Zhengjun Sun Xianli Bi Lanping Li Wenzhe Zhang Ying Wang Zhigang | 2016 | International Journal of Agricultural and Biological Engineering2016，9，2： | 1 |
| 4 | Effects of urea ammonia pretreatment on the batch anaerobic fermentation efficiency of corn stovers显示文摘In order to enhance the biogas production and provide nitrogen sources for the growth of microorganisms,experiments on urea ammonia pretreatment of corn stovers were implemented at(35±1)°C to investigate the effects of urea ammonia pretreatment on the batch anaerobic fermentation efficiency of corn stovers.This study assessed the effects of urea ammonia contents(2%,4%,and 6%)and moisture contents(30%,50%,70%and 90%)on the physical structures of lignocelluloses and the efficiency of biogas production from anaerobic fermentation of corn stovers.The results indicated that the methane production reached 230.31 mL/g VS(volatile solids)at pretreatment with 4%urea ammonia and 70%moisture contents for the batch anaerobic fermentation,which was 26.6%higher than that of the untreated group.The degradation rates of cellulose and hemicellulose were 66.34%and 75.47%after the anaerobic fermentation,respectively,which were about 22.6%and 20.9%higher than that of the untreated group,respectively.Thus,it was concluded that urea ammonia pretreatment can improve the efficiency of biogas production from anaerobic fermentation of corn stovers. | Qiang Li Fuli Yang Guoxiang Zheng Zhengjun Guan | 2019 | International Journal of Agricultural and Biological Engineering2019，12，4： | 1 |
| 5 | Thickness dependence of the crystallization and phase transition in ZrO_(2)thin films显示文摘Fluorite-structure binary oxides(e.g.,HfO_(2)and ZrO_(2))have attracted increasing interest for a broad range of applications including thermal barrier coatings,high-k dielectrics,and novel ferroelectrics.A crystalline structure plays a crucial role in determining physical and chemical properties.Structure evolution of ZrO_(2)thin films,particularly down to the nanometer scale,has not been thoroughly studied.In this work,we carried out systematic annealing analysis on the ZrO_(2)thin films.Through in-situ high-temperature X-ray diffraction(XRD)characterizations,a thickness dependence of crystallization and phase transition is observed.Irrespective of the thickness(10-300 nm),the as-prepared amorphous ZrO_(2)thin films are preferentially crystallized into a tetragonal(t)structure(high-temperature phase),which can be preserved down to room temperature(RT)upon anncaling at the corresponding crystallization temperaturc(T).When anncaling at temperaturcs higher than Tc,the transition from t to monoclinic(m;RT phase)will occur,and the quantity of the transition strongly depends on the film thickness.Our work expands the basic understanding of the phase transition in the ZrO_(2)thin films,and offers a path to the selective control over the phase structure for novel functionalities. | Yue Guan Jing Zhou Haodong Zhong Weipeng Wang Zhengjun Zhang Feng Luo Shuai Ning | 2023 | Journal of Advanced Ceramics2023，12，4： | 0 |
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